System Interface9
9 – 12
Control Field Description Reset Reboot
Bus Exchange Register
PX PX register undefined undefined
Status Registers
IMASK Interrupt service enables 0 0
ASTAT Arithmetic status 0 0
MSTAT Mode status 0 unchanged
SSTAT Stack status 0x55 0x55
ICNTL Interrupt control undefined unchanged
IFC Interrupt force/clear 0 0
Control Registers (memory-mapped)
BWAIT Boot memory wait states 3 unchanged
BPAGE Boot page 0 unchanged
SPORT1 configure Configuration 1 unchanged
SPE0 SPORT0 enable 0 unchanged
SPE1 SPORT1 enable 0 unchanged
DWAIT0–4 Data memory wait states 7 unchanged
PWAIT Program memory wait 7 unchanged
TCOUNT Timer count register undefined operates during reboot
TPERIOD Timer period register undefined unchanged
TSCALE Timer scale register undefined unchanged
ROMENABLE Program memory ROM enable 0 unchanged
PDFORCE Powerdown force 0 unchanged
PUCR Powerup context reset 0 unchanged
XTALDIS XTAL pindrive disable 0 unchanged
during powerdown
XTALDELAY Delay startup from powerdown 0 unchanged
(4096 cycles)
Serial Port Control Registers (memory-mapped, one set per SPORT)
ISCLK Internal serial clock 0 unchanged
RFSR, TFSR Frame sync required 0 unchanged
RFSW, TFSW Frame sync width 0 unchanged
IRFS, ITFS Internal frame sync 0 unchanged
INVRFS, INVTFS Invert frame sense 0 unchanged
DTYPE Companding type, format 0 unchanged
SLEN Serial word length 0 unchanged
SCLKDIV Serial clock divide undefined unchanged
RFSDIV RFS divide undefined unchanged
Multichannel word enable bits undefined unchanged
MCE Multichannel enable 0 unchanged
MCL Multichannel length 0 unchanged
MFD Multichannel frame delay 0 unchanged
INVTDV Invert transmit data valid 0 unchanged
RBUF, TBUF Autobuffering enable 0 0
TIREG, RIREG Autobuffer I index undefined unchanged
TMREG, RMREG Autobuffer M index undefined unchanged
Table 9.7 ADSP-21msp58/59 State After Reset Or Software Reboot (cont. on next page)
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